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Method and apparatus for recording data on a magnetic recording medium

a magnetic recording medium and data technology, applied in the field of magnetic recording systems, can solve the problems of erasing the data recorded on the adjacent track and the inability to accurately determine the effect of ati

Inactive Publication Date: 2008-07-24
LENOVO (SINGAPORE) PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an adjacent track interference (ATI) compensation table to store the effect of ATI on a track. The table records the number of ATI effects for a track and determines if there is any affected sector within the table. If there is, processing is performed to recover the data and reset the effect count for the track. The technical effect of this invention is to improve the accuracy and reliability of data recovery in the presence of ATI.

Problems solved by technology

If the distance between the recording / reproducing head and the disk is shortened, when data are recorded on a track, tracks adjacent to the track may be overwritten due to leakage of a magnetic field generated by the recording / reproducing head, resulting in erasing the data recorded on the adjacent tracks.
However, if data on the track is re-recorded according to the number of times of data recording on an adjacent track on one side thereof, the effect of ATI cannot be accurately determined.

Method used

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  • Method and apparatus for recording data on a magnetic recording medium

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Embodiment Construction

[0023]With reference now to the drawings, and in particular to FIG. 1, there is illustrated a block diagram of a hard disk drive in which a preferred embodiment of the present invention is incorporated. As shown, a hard disk drive 10 includes a disk 11, an spindle motor (SPM) 12, a head 13, an arm 14, a voice coil motor (VCM) 15, a drive controller 16, a read / write signal processing section 17, a data memory 18, a hard disk controller 19, and a control section 20.

[0024]Disk 11 is a disk as a magnetic recording medium on which various data inputted from the outside are recorded. On disk 11, multiple tracks T each having multiple sectors S are formed in a concentric manner. Each of the sectors has a size of 512 bytes, and position information of data recorded in units of sectors is managed for each sector. SPM 12 rotates disk 11. Head 13 performs signal reading / writing with respect to disk 11. Arm 14 supports head 13 in a fixed manner. VCM 15 feeds head 13 and arm 14 in the radial dir...

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Abstract

A method for recording data on a magnetic recording medium is disclosed. When data are written to a target track Tn, the numbers of effects on tracks Tn−1 and Tn+1 adjacent to a target track are counted as Adjacent Track Interference (ATI) effect counts Cn−1 and Cn+1, respectively, to determine whether or not the ATI effect counts Cn−1 and Cn+1 are greater than a permissible ATI count Np. If the ATI effect counts Cn−1 and Cn+1 are greater than the permissible ATI count Np, ATI error preventive processing is performed on the tracks Tn−1 and Tn+1. All sectors on the Tn−1 and Tn+1 are determined as to whether or not they are affected by ATI, and ATI error counter-measure processing is performed on all affected sectors to recover data.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application claims benefit of priority under 35 U.S.C. §§ 120, 365 to the previously filed Japanese Patent Application No. JP2006-197426 entitled, “Magnetic Recording System, Magnetic Recording Method, and Magnetic Recording Program” with a priority date of Jul. 19, 2006, which is incorporated by reference herein.BACKGROUND OF THE INVENTION[0002]1. Technical Field[0003]The present invention relates to magnetic recording systems in general, and more particularly, to a method and apparatus for recording data on a magnetic recording medium.[0004]2. Description of Related Art[0005]Hard disk drives are magnetic recording systems used for storage of information. Information is typically recorded on concentric tracks located on either side of one or more magnetic recording disks. The disk is rotatably supported by a spindle motor. Writing and reading of information to and from a track are performed by a recording / reproducing head pro...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G11B5/596
CPCG11B2020/1222G11B19/045
Inventor UEDA, MOTOHISA
Owner LENOVO (SINGAPORE) PTE LTD
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